Objectives for September 8, 2005.
[1] Understand the concepts of “impact parameter”, “scattering angle”, “cross section”, and “differential cross section” as applied to scattering.
[2] Be able to reproduce the derivation of the classical atomic model (the “planetary model”) for Hydrogen (or for any ion having only 1 electron). Realize that in this model all atoms are unstable, and be able to explain why. Know the approximate atomic lifetime for Hydrogen as predicted by this model.
[3] Be able to explain the modifications that Bohr made to the classical atomic model, and understand how these lead to the correct Hydrogen spectrum, including a derivation of the Rydberg constant.
[4] Be able to explain why atoms have “characteristic X-ray” spectra, and know the difference between the Ká , Kâ , Lá , etc. X-ray lines.
[5] Understand the results and implications of the Franck-Hertz experiment.
Homework due Friday, September 9, 2005 (as a reminder).
[1] Finish reading Chapter 3 in Thornton & Rex.
[2] Do Problems 18, 22, 27, 40, & 47 at the end of Chapter 3 (pp. 116-117) in Thornton and Rex.